Blade sharpener



FIG. 1 is a front perspective view of a blade sharpener;

FIG. 2 is a front view of the blade sharpener of FIG. 1;

FIG. 3 is a rear view of the blade sharpener of FIG. 1;

FIG. 4 is a right side view of the blade sharpener of FIG. 1

FIG. 5 is a left side view of the blade sharpener of FIG. 1;

FIG. 6 is a top view of the blade sharpener of FIG. 1; and,

FIG. 7 is a bottom view of the blade sharpener of FIG. 1.

The broken lines in the drawings illustrate features of the blade sharpener that form no part of the claim. 

CLAIM The ornamental design for a blade sharpener, as shown and described. 